﻿//
// UriExtensions.cs
//
// Author: Jeffrey Stedfast <jestedfa@microsoft.com>
//
// Copyright (c) 2013-2025 .NET Foundation and Contributors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

using System;
using System.Collections.Generic;

namespace MailKit {
	static class UriExtensions
	{
		public static IDictionary<string, string> ParsedQuery (this Uri uri)
		{
			var properties = new Dictionary<string, string> (StringComparer.OrdinalIgnoreCase);
			int index = 1;

			if (string.IsNullOrEmpty (uri.Query))
				return properties;

			// Note: the query string begins with '?'
			while (index < uri.Query.Length) {
				int startIndex = index;

				while (index < uri.Query.Length && uri.Query[index] != '=')
					index++;

				var name = uri.Query.Substring (startIndex, index - startIndex);

				if (index >= uri.Query.Length) {
					properties.Add (name, string.Empty);
					break;
				}

				startIndex = ++index;

				while (index < uri.Query.Length && uri.Query[index] != '&')
					index++;

				var value = uri.Query.Substring (startIndex, index - startIndex);

				properties.Add (name, Uri.UnescapeDataString (value));

				index++;
			}

			return properties;
		}
	}
}
